1 HD: You gain an aura of good as paladin. Use your HD instead of paladin level to determine the strength of the aura.

3 HD: You gain the lay on hands paladin class feature. Use your HD instead of paladin levels to determine the amount of hitpoints you can heal.

8 HD: You are so good you literally shine. As a standard action you can emit a powerful holy light emanating from your body. Evil creatures must make a fortitude save or be blinded for 2d4 rounds. Undead are automatically blinded and must make a will save or take 1d8 damage per HD you have. Good creatures (including good undead) are not hindered by the holy light. This ability is a supernatural ability and the DC is charisma-based.

15 HD: As a standard action you can cure disease and poison. This ability duplicates the effect of the restoration spell. Additionally, you gain immunity to everything that restoration can heal (ability drain, ability damage, negative levels, and so on).